Spicer Drive Axles Application Guidelines - Manual (Page 92)

AXAG-0200 June 2009 92
Glossary
AL Factor
- A mathematical expression of the brake
adjuster and brake chamber combination. "A" equals the
effective area, in square inches, of the brake chamber (e.g.,
Type 30 chamber has effective area of 30 sq.-in.). "L"
equals the effective length, in inches, of the slack adjuster.
For example, 30 x 6 in. = 180 AL factor
Alignment
- Method of maintaining proper relationship
between all components of the steering system.
Amboid Gear
- Modified Spiral Bevel Gear that allows
the pinion to be positioned above the ring centerline.
Analog Processing
- A method of processing information
used in older ABS control units. Today's Electronic
Control Units (ECUs) use digital processing, which is
many times faster and more reliable.
Anchor Pin
- A pin or pins used to retain brake shoes
within the brake assembly.
Anti-compounding
- A system that prevents application
of service brakes from compounding the force exerted by
parking brakes. This guards against damage to brake
components due to excessive loads.
Antilock Brake System
- See " ABS ".
Application Time
- Time elapsed between depression of
the brake treadle and engagement of the linings with the
drums (or, per FMVSS 121, the point at which all service
chambers reach 60 psi).
Application Valve
- Air valve, such as foot valve or trailer
control valve, which controls the pressure delivered to the
brake chambers.
ASR (Anti-Spin Regulation)
- See " ATC ".
ATC (Automatic Traction Control)
- Also called ASR,
it's an optional system that is available on 4- and 6-
channel ABS systems. Automatic traction control
minimizes wheel slipping during acceleration by
controlling both the engine throttle and brake pressures.
Automatic Brake Adjuster
- See " ABA ".
Automatic Traction Control
- See " ATC ".
Auxiliary Lift Axle
- An extra axle often kept in a lifted
position and only dropped to the pavement when its extra
load carrying capacity is needed.
Auxiliary Retarder
- See " Retarder ".
Auxiliary Transmission
- Additional gear box increasing
the gear ratio combinations when used with main
transmission or multi-speed axles.
Axle Carrier Assembly
- Portion of the axle assembly
that contains the drive gears and differential. To complete
the axle assembly the carrier assembly is combined with
the housing.
Axle, Live
- Driven Axle
Axle Mounting Centers
- Also referred to as the
‘Suspension Mounting Centers’ . This is the distance
between centerlines of where the suspension clamps to the
axle.
Axle Shaft
- Transmits torque from the wheel differential
to the wheel equipment.
Axle Shaft Floating
- Shaft carries no vehicle loads but
transmits torque.
Axle Shaft Semi-floating
- Shaft carries vehicle loads as
well as torque.
Axle Shift System
- The actual control mechanism that is
employed to control movement of a shift fork or sliding
clutch to vary the axle ratio. Three general types are
employed for this purpose:
1. Air shift system
2. Electric over air shift system
3. Electric shift system
Axle Spindle
- Used on a full floating housing design,
supports the wheel end system.
BCCC Dimension
- Distance from the Brake Shoe
centerline to the Brake Chamber centerline.
Beam Drop
- Distance from the kingpin to spindle
intersection to the spring mounting pad surface.
Bearing Shoulder to Bearing Shoulder Dimension
-
Distance from the machined inner bearing contact point on
one side of the axle to the other machined inner bearing
contact point on the other side.
Belleville Washer
- Also known as coned-disc springs or
Belleville disc springs. They provide very high loads at
small deflection and also maintain a constant force
regardless of dimensional variations due to wear,
temperature changes or tolerances.
Bell-mouthed Drum
- Drum with variation of inner
diameter (i.e., greater at open end), preventing full contact
with brake lining.